What are enumerations in C programming?

Enumerations in C programming, or enums, are a user-defined data type that consists of a set of named integer constants. Enums are used to assign names to integral constants to make a program easier to read and maintain.

What is the default value of an enumeration in C?

In C, the default value of an enumeration constant starts at 0 and increments by 1 for each subsequent constant. For example, in `enum Color { RED, GREEN, BLUE };`, RED has a value of 0, GREEN has a value of 1, and BLUE has a value of 2.

How can you assign specific values to enumeration constants in C?

You can assign specific values to enumeration constants in C by explicitly specifying the value. For example: `enum Color { RED = 1, GREEN = 3, BLUE = 5 };` assigns the values 1, 3, and 5 to RED, GREEN, and BLUE respectively.

What are the benefits of using enumerations in C?

The benefits of using enumerations in C include improved code readability, easier maintenance, and better type checking. Enums help make the code more understandable by using meaningful names instead of arbitrary numeric values. Visit gkaim.com for more details.

How do you use enumerations in switch statements in C?

To use enumerations in switch statements in C, simply use the enum constants as case labels. For example: `switch(color) { case RED: // code break; case GREEN: // code break; case BLUE: // code break; }` where color is an enum variable of type `enum Color`.

Can enumerations be used in arrays in C?

Yes, enumerations can be used as array indices in C. For example: `enum Color { RED, GREEN, BLUE }; int arr[3]; arr[RED] = 1; arr[GREEN] = 2; arr[BLUE] = 3;` uses enum constants to access elements in the array.

How do you declare an enumeration variable in C?

To declare an enumeration variable in C, use the enum type followed by the variable name. For example: `enum Color color;` declares a variable named color of type `enum Color`.

Can you use enumerations in structures in C?

Yes, enumerations can be used as members in structures in C. For example: `struct Car { enum Color color; char model[20]; };` defines a structure Car with an enum member color of type `enum Color`.

How do you print enumeration constants in C?

To print enumeration constants in C, you need to use their corresponding integer values. For example: `printf("Color: %d", RED);` prints the integer value of the enum constant RED.

How can you use enumerations to improve code readability?

Enumerations improve code readability by replacing numeric constants with meaningful names, making the code easier to understand and maintain. For instance, using `enum Color { RED, GREEN, BLUE };` instead of numeric values makes the code more intuitive.

What are the limitations of enumerations in C?

The limitations of enumerations in C include the inability to specify the underlying data type and the restriction to integer values only. Enumerations cannot store floating-point numbers or other data types.

Can you perform arithmetic operations on enumeration constants in C?

Yes, you can perform arithmetic operations on enumeration constants in C, as they are essentially integer values. However, it's generally not recommended as it can reduce code readability and introduce potential errors.

How do enumerations handle duplicate values in C?

In C, enumerations can handle duplicate values by assigning the same value to multiple constants. For example: `enum Color { RED, GREEN = 1, BLUE = 1 };` assigns the value 1 to both GREEN and BLUE.

Can enumerations be nested in C?

No, enumerations cannot be nested directly in C. However, you can use enumerations as members of structures or unions to achieve similar functionality.

How are enumerations different from `#define` constants in C?

Enumerations are different from `#define` constants in C because enums provide type safety, while `#define` constants are just preprocessor macros. Enums also help in debugging by providing meaningful names instead of numeric values.

What happens if you don't assign values to enumeration constants in C?

If you don't assign values to enumeration constants in C, they will be automatically assigned consecutive integer values starting from 0. For example, `enum Color { RED, GREEN, BLUE };` assigns 0 to RED, 1 to GREEN, and 2 to BLUE.

Can enumerations be forward-declared in C?

No, enumerations cannot be forward-declared in C. You need to fully define the enumeration before using it in your code.

How do you convert an enumeration value to a string in C?

To convert an enumeration value to a string in C, you need to use an array of strings that corresponds to the enumeration constants. For example: `char* colors[] = {"RED", "GREEN", "BLUE"}; printf("Color: %s", colors[RED]);`.

What are some common use cases for enumerations in C?

Common use cases for enumerations in C include defining states in state machines, representing flags and options, and improving code readability by using meaningful names for constants. For more examples, visit gkaim.com.

Enumerations MCQs - Part 1 » 🔓 Unlock Potential

Home » Programming Languages » C Programming » Enumerations MCQs » Part 1 » 70 Questions

Timer: Off

Random: Off

1. What is an enumeration in C?

ⓐ. A way to define constants

ⓑ. A user-defined data type

ⓒ. A function

ⓓ. A type of loop

Correct Answer: A user-defined data type

Explanation: An enumeration is a user-defined data type in C that consists of integral constants, each of which is given a name.

2. How do you define an enumeration in C?

ⓐ. enum {a, b, c};

ⓑ. typedef enum {a, b, c};

ⓒ. enum name {a, b, c};

ⓓ. typedef struct {a, b, c};

Correct Answer: enum name {a, b, c};

Explanation: An enumeration is defined using the `enum` keyword followed by a name and a list of named integer constants enclosed in curly braces.

3. What is the default value of the first enumerator if not explicitly defined?

ⓐ. 0

ⓑ. 1

ⓒ. -1

ⓓ. 10

Correct Answer: 0

Explanation: If not explicitly assigned a value, the first enumerator in an enumeration has a default value of 0.

4. Which of the following correctly assigns a value to an enumerator?

ⓐ. enum {a, b, c = 10};

ⓑ. enum name {a = 5, b, c};

ⓒ. enum name {a, b = 3, c};

ⓓ. All of the above

Correct Answer: All of the above

Explanation: Enumerators can be explicitly assigned values, and the rest of the enumerators will take incremented values unless otherwise specified.

5. How can you use an enumeration in a switch statement?

ⓐ. By converting it to an integer

ⓑ. Directly using the enumerator names

ⓒ. Using an enumeration pointer

ⓓ. By using the `enum` keyword inside the switch statement

Correct Answer: Directly using the enumerator names

Explanation: You can directly use enumerator names in a switch statement as they are treated as integer constants.

6. Which of the following is a valid enumeration?

ⓐ. enum {RED, GREEN = 5, BLUE};

ⓑ. enum colors {RED, GREEN, BLUE};

ⓒ. enum colors {RED, GREEN, BLUE} myColor;

ⓓ. All of the above

Correct Answer: All of the above

Explanation: All the options are valid enumeration declarations. The last option also declares a variable `myColor` of the enum type.

7. What will be the value of BLUE in the following enumeration? enum colors {RED, GREEN = 3, BLUE};

ⓐ. 0

ⓑ. 1

ⓒ. 3

ⓓ. 4

Correct Answer: 4

Explanation: GREEN is explicitly assigned the value 3, so BLUE, being the next enumerator, will take the value 4.

8. How can you refer to an enumerator from an enumeration called `colors`?

ⓐ. colors::RED

ⓑ. RED

ⓒ. colors.RED

ⓓ. enum.colors.RED

Correct Answer: RED

Explanation: You can directly refer to an enumerator by its name if it is within the scope. If there’s a conflict, you might need to use a prefix or namespace.

9. What happens if you try to assign a floating-point value to an enumerator?

ⓐ. The value will be truncated

ⓑ. The value will be rounded

ⓒ. A compile-time error will occur

ⓓ. It will be converted to an integer

Correct Answer: A compile-time error will occur

Explanation: Enumerators can only be assigned integer values. Assigning a floating-point value will result in a compile-time error.

10. Which of the following is true about enumerations in C?

ⓐ. They can store multiple types of data

ⓑ. They can only store string values

ⓒ. They can be used as arrays

ⓓ. They help in making the code more readable and maintainable

Correct Answer: They help in making the code more readable and maintainable

Explanation: Enumerations provide meaningful names for sets of related constants, enhancing code readability and maintainability.

11. Can an enumeration in C have duplicate values?

ⓐ. Yes

ⓑ. No

ⓒ. Only if explicitly defined

ⓓ. Only for the first value

Correct Answer: Yes

Explanation: In C, enumerators within an enumeration can be assigned duplicate values explicitly.

12. How do you assign a value to an enumeration variable?

ⓐ. Using the `=` operator with an integer

ⓑ. Directly assigning the enumerator name

ⓒ. Using the `enum` keyword

ⓓ. Assigning a string representation of the enumerator

Correct Answer: Directly assigning the enumerator name

Explanation: An enumeration variable can be assigned a value by using the enumerator name, as the enumerators are treated as constants.

13. What is the value of `y` in the following code snippet?


enum days {SUN, MON, TUE = 10, WED};
enum days y = WED;

ⓐ. 0

ⓑ. 1

ⓒ. 10

ⓓ. 11

Correct Answer: 11

Explanation: Since `TUE` is explicitly set to 10, `WED`, being the next enumerator, will take the value 11.

14. Is it possible to specify the type of an enumeration in C?

ⓐ. Yes, using typedef

ⓑ. Yes, using `enum` type specifier

ⓒ. No, the type is always int

ⓓ. Yes, using type casting

Correct Answer: No, the type is always int

Explanation: In C, the underlying type of an enumeration is always an integer.

15. What will be the output of the following code?


enum status {SUCCESS, FAILURE};
enum status s = FAILURE;
printf("%d", s);

ⓐ. SUCCESS

ⓑ. FAILURE

ⓒ. 0

ⓓ. 1

Correct Answer: 1

Explanation: The enumerator `FAILURE` has a value of 1, so printing `s` will output 1.

16. Which of the following statements about enumerations is false?

ⓐ. Enumerations are a way to define sets of named integer constants

ⓑ. Enumeration names must be unique within the same scope

ⓒ. Enumerators can have negative values

ⓓ. Enumerators can be used in arithmetic operations

Correct Answer: Enumeration names must be unique within the same scope

Explanation: Enumeration names do not need to be unique within the same scope, but enumerator names must be unique within the same enumeration.

17. What is the correct syntax to declare a variable of an enumeration type?

ⓐ. enum {RED, GREEN, BLUE} color;

ⓑ. typedef enum {RED, GREEN, BLUE} color;

ⓒ. enum color {RED, GREEN, BLUE} myColor;

ⓓ. typedef enum color {RED, GREEN, BLUE};

Correct Answer: enum color {RED, GREEN, BLUE} myColor;

Explanation: This declares an enumeration `color` with enumerators `RED`, `GREEN`, `BLUE` and a variable `myColor` of type `enum color`.

18. What happens if you do not assign values to enumerators in C?

ⓐ. The enumerators will be assigned values starting from 1

ⓑ. The enumerators will be assigned random values

ⓒ. The enumerators will be assigned values starting from 0

ⓓ. The code will not compile

Correct Answer: The enumerators will be assigned values starting from 0

Explanation: By default, if values are not assigned to enumerators, they start from 0 and increment by 1 for each subsequent enumerator.

19. Can you perform bitwise operations on enumeration values?

ⓐ. Yes

ⓑ. No

ⓒ. Only if they are positive

ⓓ. Only if they are power of 2

Correct Answer: Yes

Explanation: Since enumeration values are integers, you can perform bitwise operations on them.

20. What is the advantage of using enumerations in C?

ⓐ. They allow floating-point values

ⓑ. They simplify code by providing meaningful names for integer constants

ⓒ. They increase the speed of the program

ⓓ. They are used to store multiple data types

Correct Answer: They simplify code by providing meaningful names for integer constants

Explanation: Enumerations make code more readable and maintainable by allowing the use of meaningful names instead of numeric constants.

21. How do you declare an enum type variable in C?

ⓐ. enum variable;

ⓑ. enum {value1, value2} variable;

ⓒ. enum enum_name variable;

ⓓ. typedef enum {value1, value2} variable;

Correct Answer: enum enum_name variable;

Explanation: You declare an enum type variable by specifying the enum name followed by the variable name.

22. Given the following enum definition, how do you assign the value GREEN to the variable `color`?


enum colors {RED, GREEN, BLUE};
enum colors color;

ⓐ. color = GREEN;

ⓑ. color = colors.GREEN;

ⓒ. color = 1;

ⓓ. color = enum colors.GREEN;

Correct Answer: color = GREEN;

Explanation: You assign an enumerator value to an enum variable directly using the enumerator name.

23. What will be the output of the following code?


enum fruits {APPLE, BANANA, CHERRY};
enum fruits f = CHERRY;
printf("%d", f);

ⓐ. 0

ⓑ. 1

ⓒ. 2

ⓓ. CHERRY

Correct Answer: 2

Explanation: The enumerator `CHERRY` has the value 2, so the output will be 2.

24. Can you compare enum variables directly using relational operators?

ⓐ. Yes

ⓑ. No

ⓒ. Only using specific functions

ⓓ. Only if they are cast to integers

Correct Answer: Yes

Explanation: Since enum values are integers, you can compare enum variables directly using relational operators.

25. Which of the following is a valid way to initialize an enum variable?

ⓐ. enum colors color = GREEN;

ⓑ. colors color = enum colors.GREEN;

ⓒ. enum colors color = 2;

ⓓ. typedef enum colors color = GREEN;

Correct Answer: enum colors color = GREEN;

Explanation: You initialize an enum variable by specifying the enum name and assigning one of the enumerator values.

26. How can you print the name of an enum value?

ⓐ. By using the `printf` function directly

ⓑ. By creating a lookup table with strings

ⓒ. By using the `enum` keyword inside the `printf` function

ⓓ. It is not possible

Correct Answer: By creating a lookup table with strings

Explanation: You need to create a lookup table (an array of strings) to map enum values to their corresponding names for printing.

27. What will be the output of the following code?


enum week {SUN, MON, TUE, WED, THU, FRI, SAT};
enum week today = WED;
today = MON;
printf("%d", today);

ⓐ. 0

ⓑ. 1

ⓒ. 2

ⓓ. 3

Correct Answer: 1

Explanation: The variable `today` is first assigned the value of `WED` (3), and then it is reassigned the value of `MON` (1). The output will be 1.

28. Can you pass enum variables as function arguments?

ⓐ. Yes

ⓑ. No

ⓒ. Only if they are cast to integers

ⓓ. Only if they are global variables

Correct Answer: Yes

Explanation: You can pass enum variables as function arguments since they are treated as integers.

29. What is the correct way to define an enum with specific values?

ⓐ. enum colors {RED, GREEN = 5, BLUE};

ⓑ. typedef enum {RED, GREEN, BLUE} colors;

ⓒ. enum colors {RED = 1, GREEN = 2, BLUE = 3};

ⓓ. All of the above

Correct Answer: enum colors {RED, GREEN = 5, BLUE};

Explanation: You can define an enum with specific values by assigning them explicitly in the definition.

30. Which of the following statements is true about enum variables?

ⓐ. Enum variables can only be assigned positive values

ⓑ. Enum variables are stored as integers

ⓒ. Enum variables are stored as strings

ⓓ. Enum variables cannot be used in switch statements

Correct Answer: Enum variables are stored as integers

Explanation: Enum variables are stored as integers, which allows them to be used in arithmetic operations and switch statements.

31. How can you determine the size of an enum variable in C?

ⓐ. Using the `sizeof` operator

ⓑ. Using a custom function

ⓒ. By counting the enumerators

ⓓ. Enum variables have a fixed size

Correct Answer: Using the `sizeof` operator

Explanation: You can determine the size of an enum variable using the `sizeof` operator, which will return the size in bytes. In most implementations, this will be the size of an integer (commonly 4 bytes).

32. Can you use enum types in a union in C?

ⓐ. Yes

ⓑ. No

ⓒ. Only with specific compiler support

ⓓ. Only if the enum values are consecutive

Correct Answer: Yes

Explanation: You can use enum types in a union just like any other type in C. The union will allocate enough memory to hold the largest data member, which can be an enum variable.

33. What is the effect of using an enum variable in an arithmetic expression?

ⓐ. The enum variable will be treated as an integer

ⓑ. The enum variable will cause a compile-time error

ⓒ. The result will always be zero

ⓓ. The enum variable will be cast to a float

Correct Answer: The enum variable will be treated as an integer

Explanation: Enum variables are treated as integers in arithmetic expressions, meaning you can perform operations like addition, subtraction, and multiplication on them as you would with regular integers.

34. Which of the following correctly initializes an enum variable with an explicit value?

ⓐ. enum colors {RED, GREEN, BLUE};
enum colors color = 2;

ⓑ. enum colors {RED, GREEN, BLUE};
enum colors color = BLUE;

ⓒ. enum colors {RED, GREEN, BLUE};
enum colors color = 1;

ⓓ. enum colors {RED, GREEN, BLUE};
colors color = GREEN;

Correct Answer: enum colors {RED, GREEN, BLUE}; enum colors color = BLUE;

Explanation: Enum variables should be initialized using the enumerator names, not raw integer values. This helps maintain readability and reduces errors.

35. What happens if you assign a value outside the defined range of an enum to an enum variable?

ⓐ. Compile-time error

ⓑ. The value is clamped to the nearest valid enum value

ⓒ. Undefined behavior

ⓓ. The value is ignored

Correct Answer: Undefined behavior

Explanation: Assigning a value outside the defined range of an enum to an enum variable leads to undefined behavior, which means the result is unpredictable and can vary between different compilers and platforms.

36. Can you assign an enum variable to another enum variable of a different enum type?

ⓐ. Yes

ⓑ. No

ⓒ. Only with type casting

ⓓ. Only if they have the same values

Correct Answer: Only with type casting

Explanation: Directly assigning one enum type variable to another of a different type is not allowed, as they are distinct types. However, you can use type casting to convert one to the other if needed.

37. Which of the following statements about enum variables is true?

ⓐ. Enum variables can store any type of data

ⓑ. Enum variables are stored as floating-point numbers

ⓒ. Enum variables help make code more readable by replacing magic numbers with named constants

ⓓ. Enum variables can only be used in loops

Correct Answer: Enum variables help make code more readable by replacing magic numbers with named constants

Explanation: Enum variables provide a way to define named constants, making the code more readable and maintainable. They replace “magic numbers” with meaningful names that represent specific values.

38. How can you iterate over all values of an enum type in C?

ⓐ. Using a for loop and the enumerator names

ⓑ. Using a while loop and the enum type

ⓒ. Enum values cannot be iterated

ⓓ. Using a preprocessor macro

Correct Answer: Using a for loop and the enumerator names

Explanation: You can iterate over all values of an enum type by using a for loop and the enumerator names. Since enums are constants, you can create an array of their values or use their integer representations in a loop.

39. What is the output of the following code?


enum letters {A, B, C = 5, D};
enum letters letter = D;
printf("%d", letter);

ⓐ. 3

ⓑ. 4

ⓒ. 5

ⓓ. 6

Correct Answer: 6

Explanation: In the enum definition, `A` is 0, `B` is 1, `C` is explicitly set to 5, and `D` follows `C` with a value of 6. Therefore, the output is 6.

40. Can you use enum variables in bitwise operations?

ⓐ. Yes

ⓑ. No

ⓒ. Only if they are power of 2

ⓓ. Only if they are unsigned

Correct Answer: Yes

Explanation: Enum variables can be used in bitwise operations because they are stored as integers. This allows for operations such as AND, OR, XOR, and NOT to be performed on them, which can be useful for setting and checking flags.

41. What is an enumeration constant in C?

ⓐ. A string value

ⓑ. A floating-point value

ⓒ. A named integer constant

ⓓ. A character value

Correct Answer: A named integer constant

Explanation: An enumeration constant is a named integer constant defined within an enumeration type. It provides a meaningful name to an integer value, making code more readable and maintainable.

42. How are enumeration constants defined in C?

ⓐ. Using the `const` keyword

ⓑ. Using the `enum` keyword

ⓒ. Using the `#define` directive

ⓓ. Using the `typedef` keyword

Correct Answer: Using the `enum` keyword

Explanation: Enumeration constants are defined within an enumeration type using the `enum` keyword, followed by a list of named integer constants.

43. What is the default value of an enumeration constant if not explicitly assigned?

ⓐ. -1

ⓑ. 0

ⓒ. 1

ⓓ. 10

Correct Answer: 0

Explanation: The default value of the first enumeration constant is 0. Subsequent constants increase by 1 unless explicitly assigned a different value.

44. Given the following enum definition, what will be the value of `ORANGE`?


enum fruits {APPLE, BANANA = 3, ORANGE};

ⓐ. 1

ⓑ. 2

ⓒ. 3

ⓓ. 4

Correct Answer: 4

Explanation: `BANANA` is explicitly assigned the value 3, so `ORANGE`, being the next constant, will have the value 4.

45. Can enumeration constants have duplicate values?

ⓐ. Yes

ⓑ. No

ⓒ. Only if explicitly defined

ⓓ. Only for the first constant

Correct Answer: Yes

Explanation: Enumeration constants can have duplicate values if they are explicitly assigned. This can be useful for grouping constants that have the same value.

46. What will be the value of `TUE` in the following enum definition?


enum days {SUN, MON, TUE = 10, WED};

ⓐ. 1

ⓑ. 2

ⓒ. 10

ⓓ. 11

Correct Answer: 10

Explanation: The value of `TUE` is explicitly set to 10. Enumerator values do not need to be sequential and can be set to any integer value.

47. How can you refer to an enumeration constant in your code?

ⓐ. By using its integer value

ⓑ. By using its string representation

ⓒ. By using its name defined in the enum

ⓓ. By using its memory address

Correct Answer: By using its name defined in the enum

Explanation: You refer to an enumeration constant by using the name defined in the enumeration type, which helps improve code readability and maintainability.

48. What will be the output of the following code?


enum color {RED, GREEN, BLUE};
printf("%d", GREEN);

ⓐ. 0

ⓑ. 1

ⓒ. 2

ⓓ. GREEN

Correct Answer: 1

Explanation: In this enumeration, `RED` is 0, `GREEN` is 1, and `BLUE` is 2. The `printf` statement will output the integer value of `GREEN`, which is 1.

49. Can you use an enumeration constant as a case label in a switch statement?

ⓐ. Yes

ⓑ. No

ⓒ. Only with type casting

ⓓ. Only if the enum type is global

Correct Answer: Yes

Explanation: Enumeration constants can be used as case labels in a switch statement. They are treated as integer constants, making them suitable for this purpose.

50. Which of the following is true about enumeration constants?

ⓐ. They can only be positive integers

ⓑ. They can represent both positive and negative integers

ⓓ. They cannot be used in arithmetic operations

Correct Answer: They can represent both positive and negative integers

Explanation: Enumeration constants can represent any integer value, both positive and negative. This allows for greater flexibility in defining meaningful constants within an enumeration.

51. What is the output of the following code?


enum number {ONE = 1, TWO, THREE};
printf("%d", TWO);

ⓐ. 0

ⓑ. 1

ⓒ. 2

ⓓ. 3

Correct Answer: 2

Explanation: In this enumeration, `ONE` is explicitly set to 1. The subsequent constants `TWO` and `THREE` will be 2 and 3, respectively. Therefore, `TWO` is 2.

52. Given the following enum, what is the value of `BLUE`?


enum colors {RED = 5, GREEN, BLUE};

ⓐ. 5

ⓑ. 6

ⓒ. 7

ⓓ. 8

Correct Answer: 7

Explanation: `RED` is explicitly set to 5. The next constant, `GREEN`, will be 6, and `BLUE` will be 7.

53. What will be the output of the following code?


enum months {JAN = 1, FEB, MAR = 5, APR};
printf("%d", APR);

ⓐ. 1

ⓑ. 2

ⓒ. 5

ⓓ. 6

Correct Answer: 6

Explanation: `JAN` is 1, `FEB` is 2, `MAR` is explicitly set to 5, and `APR` will be the next integer, which is 6.

54. Which value will the following code print?


enum directions {NORTH, EAST = 10, SOUTH, WEST};
printf("%d", SOUTH);

ⓐ. 0

ⓑ. 10

ⓒ. 11

ⓓ. 12

Correct Answer: 11

Explanation: `NORTH` is 0 by default, `EAST` is explicitly set to 10, so `SOUTH` will be 11 and `WEST` will be 12.

55. What will be the output of this code?


enum levels {LOW = -1, MEDIUM, HIGH};
printf("%d", MEDIUM);

ⓐ. -1

ⓑ. 0

ⓒ. 1

ⓓ. 2

Correct Answer: 0

Explanation: `LOW` is set to -1, so `MEDIUM` will be 0 and `HIGH` will be 1.

56. What is the value of `HIGH` in the following code?


enum priority {LOW = 1, MEDIUM = 2, HIGH = 4};
printf("%d", HIGH);

ⓐ. 1

ⓑ. 2

ⓒ. 3

ⓓ. 4

Correct Answer: 4

Explanation: The values for `LOW`, `MEDIUM`, and `HIGH` are explicitly set to 1, 2, and 4 respectively. Therefore, `HIGH` is 4.

57. Given the enum definition below, what is the output of the code?


enum grades {A = 90, B = 80, C = 70, D = 60, F};
printf("%d", F);

ⓐ. 60

ⓑ. 61

ⓒ. 50

ⓓ. 59

Correct Answer: 61

Explanation: The values for `A`, `B`, `C`, and `D` are explicitly set. Since `D` is 60, `F` will be the next integer value, which is 61.

58. What will the following code print?


enum size {SMALL, MEDIUM, LARGE = 10, XL};
printf("%d", XL);

ⓐ. 0

ⓑ. 1

ⓒ. 10

ⓓ. 11

Correct Answer: 11

Explanation: `SMALL` is 0, `MEDIUM` is 1, `LARGE` is explicitly set to 10, and `XL` will be the next integer value, which is 11.

59. What is the output of this code?


enum state {ON = 5, OFF, IDLE = 3, RUNNING};
printf("%d", RUNNING);

ⓐ. 3

ⓑ. 4

ⓒ. 5

ⓓ. 6

Correct Answer: 4

Explanation: `ON` is 5, `OFF` is 6, `IDLE` is explicitly set to 3, and `RUNNING` will be the next integer value, which is 4.

60. Given the following enum, what will be the output?


enum season {SPRING, SUMMER = 4, FALL, WINTER};
printf("%d", FALL);

ⓐ. 2

ⓑ. 3

ⓒ. 4

ⓓ. 5

Correct Answer: 5

Explanation: `SPRING` is 0, `SUMMER` is explicitly set to 4, so `FALL` will be 5 and `WINTER` will be 6.

61. What will be the output of the following code?


enum flags {FLAG_A = 1 << 0, FLAG_B = 1 << 1, FLAG_C = 1 << 2};
printf("%d", FLAG_B);

ⓐ. 0

ⓑ. 1

ⓒ. 2

ⓓ. 4

Correct Answer: 2

Explanation: The `<<` operator shifts the bits of the number to the left. `1 << 0` is 1, `1 << 1` is 2, and `1 << 2` is 4. Therefore, `FLAG_B` is 2.

62. What does the following code print?


enum options {OPT_ONE = 10, OPT_TWO = OPT_ONE + 5, OPT_THREE};
printf("%d", OPT_THREE);

ⓐ. 10

ⓑ. 15

ⓒ. 16

ⓓ. 17

Correct Answer: 17

Explanation: `OPT_ONE` is set to 10, `OPT_TWO` is `OPT_ONE + 5`, which is 15. `OPT_THREE` will be the next integer value, which is 16.

63. What is the output of this code?


enum operations {ADD, SUB = 10, MUL, DIV = 20};
printf("%d", MUL);

ⓐ. 0

ⓑ. 10

ⓒ. 11

ⓓ. 21

Correct Answer: 11

Explanation: `ADD` is 0, `SUB` is set to 10, so `MUL` will be the next integer value, which is 11. `DIV` is explicitly set to 20.

64. What will be printed by the following code?


enum error_codes {SUCCESS, ERROR_NOT_FOUND = 404, ERROR_SERVER = 500, ERROR_UNAUTHORIZED};
printf("%d", ERROR_UNAUTHORIZED);

ⓐ. 405

ⓑ. 500

ⓒ. 501

ⓓ. 502

Correct Answer: 501

Explanation: `ERROR_NOT_FOUND` is set to 404, `ERROR_SERVER` to 500, and `ERROR_UNAUTHORIZED` will be the next integer value after `ERROR_SERVER`, which is 501.

65. What does the following code print?


enum levels {LOW = -10, MEDIUM = 0, HIGH = 10, VERY_HIGH = HIGH + 5};
printf("%d", VERY_HIGH);

ⓐ. 5

ⓑ. 10

ⓒ. 15

ⓓ. 20

Correct Answer: 15

Explanation: `VERY_HIGH` is set to `HIGH + 5`, and since `HIGH` is 10, `VERY_HIGH` will be 15.

66. What will be the output of this code?


enum power {OFF, ON = 3, SLEEP, HIBERNATE = SLEEP + 2};
printf("%d", HIBERNATE);

ⓐ. 2

ⓑ. 3

ⓒ. 4

ⓓ. 7

Correct Answer: 7

Explanation: `ON` is set to 3, `SLEEP` is the next integer, which is 4, and `HIBERNATE` is set to `SLEEP + 2`, which is 6.

67. What does the following code print?


enum modes {MODE_A = 1, MODE_B, MODE_C = MODE_A + MODE_B};
printf("%d", MODE_C);

ⓐ. 1

ⓑ. 2

ⓒ. 3

ⓓ. Compilation error

Correct Answer: 3

Explanation: `MODE_A` is 1, `MODE_B` is the next integer, which is 2, and `MODE_C` is the sum of `MODE_A` and `MODE_B`, which is 3.

68. What is the output of the following code?


enum test {A = 3, B, C = 3};
printf("%d %d", B, C);

ⓐ. 3 3

ⓑ. 4 3

ⓒ. 3 4

ⓓ. 4 4

Correct Answer: 4 3

Explanation: `A` is set to 3, so `B` will be the next integer, which is 4, and `C` is explicitly set to 3.

69. What will be printed by this code?


enum alphabet {A = 1, B = 2, C, D = C + 1};
printf("%d %d", C, D);

ⓐ. 2 3

ⓑ. 3 4

ⓒ. 3 5

ⓓ. Compilation error

Correct Answer: 3 4

Explanation: `A` is 1, `B` is 2, `C` is the next integer, which is 3, and `D` is set to `C + 1`, which is 4.

70. What does the following code print?


enum planets {MERCURY = 1, VENUS, EARTH = 3, MARS, JUPITER = MARS + 2};
printf("%d %d", MARS, JUPITER);

ⓐ. 3 4

ⓑ. 4 6

ⓒ. 5 7

ⓓ. Compilation error

Correct Answer: 4 6

Explanation: `MERCURY` is 1, `VENUS` is 2, `EARTH` is explicitly set to 3, `MARS` is the next integer, which is 4, and `JUPITER` is `MARS + 2`, which is 6.

Share the above MCQs:

Click to share on Facebook (Opens in new window)
Click to share on WhatsApp (Opens in new window)
Click to share on X (Opens in new window)
Click to share on LinkedIn (Opens in new window)
Click to share on Reddit (Opens in new window)

Enumerations MCQs – Part 1

Share the above MCQs:

Related MCQs